Comparison of Electrical Discharge Machining Speed of Tool Electrodes with Different Thermo-physical Properties Related to Ease of Boiling
Comparison of Electrical Discharge Machining Speed of Tool Electrodes with Different Thermo-physical Properties Related to Ease of Boiling
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DOI：
10.1016/j.procir.2017.12.036
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Xiaoming Yue;Xiaoming Yue;Xiaodong Yang;M. Kunieda
中科院分区：
文献类型：
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作者：
Xiaoming Yue;Xiaoming Yue;Xiaodong Yang;M. Kunieda
本文揭示了电火花加工中工具电极材料易沸腾性对加工速度的影响。认为在放电过程中，阳极和阴极都向差距内发射金属蒸气射流。差距中射流的相互作用产生了一种作用于熔池的剪切力，有助于去除工件中的熔融材料。此外，还发现工具电极的沸点越低，射流之间的相互作用越强，剪切力越大，从而放电坑的材料去除体积越大。为了验证上述思想，通过分子动力学模拟研究了射流间的相互作用对材料去除过程的影响。然后，在一系列的单次放电实验中，使用不同的工具电极与沸腾的容易程度相关的热物理性能的放电火山口的材料去除体积进行了比较，以验证模拟结果。最后，利用电火花加工实验验证了易喷射蒸汽射流的工具电极材料具有较高的加工性能。
This paper reveals the influence of easiness of boiling of tool electrode materials on the machining speed in EDM. It is considered that during the discharge process, both the anode and cathode emit the metal vapor jets into the gap. The interaction of the jets in the gap generates a kind of shear force acting on the molten pool, which helps remove the molten material in the workpiece. Moreover, it was found that lower boiling point of tool electrode results in stronger interaction of the jets and larger shear force, thereby the material removal volume of the discharge crater will be larger. To validate the above thoughts, the effect of the interaction of the jets on the material removal process was investigated through the molecular dynamics simulation. Then, the material removal volume of the discharge crater in a series of single discharge experiments using tool electrodes with different thermo-physical properties related to the easiness of boiling was compared to verify the simulation results. Finally, the machining experiments were performed using a sinking EDM machine to verify the higher removal performance of tool electrode materials which are easy to emit vapor jets.